Manufacture method of metal plate substrate for computer-to-plate of inkjet printing

This describes a way to make metal printing plates for inkjet printers that connect directly to a computer. It involves preparing a metal surface, either by an electrical process called anodization or by mechanical methods like sanding, and then coating it with a special water-attracting polymer paint. This paint, containing tiny particles, helps the plate absorb ink effectively and resist wear, leading to sharper printed images. The claims specify that the ink's contact angle on the coated plate should fall within a range of 2 to 75 degrees, ideally between 20 and 40 degrees.